python.pkgs.django_tagging: move to separate expression

pkgs/development/python-modules/django_tagging/default.nix

@@ -0,0 +1,22 @@
+{ stdenv, buildPythonPackage, fetchPypi, django }:
+
+buildPythonPackage rec {
+  pname = "django-tagging";
+  version = "0.4.5";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "00ki1g6pb2lnaj4lh0s865mmlf4kdwx7a6n38iy5qz9qv4xrvz4q";
+  };
+
+  # error: invalid command 'test'
+  doCheck = false;
+
+  propagatedBuildInputs = [ django ];
+
+  meta = {
+    description = "A generic tagging application for Django projects";
+    homepage = https://github.com/Fantomas42/django-tagging;
+  };
+}